the u.s. stepped up missile defense along syria's border with turkey, hoping to stave off the potential use of chemical weapons against anti-assad rebels. for the first time the u.s. is formally recognizing rebels' attempt to overthrow president assad and we are at the end game, or are we? martha? >> i think we're closer then we have ever been certainly. i think even two weeks ago there were a lot of people saying this could be months and months and months. we have no idea when this will end. but i think if you look at where those rebels are advancing in damas cass, i think it really could end there. you've got suburbs. you're seeing this extraordinary video coming out of damascus with the suburbs virtually on fire. the thing i think is most frightening about this is everybody, the rebels, regime, everybody is just trying -- destroying everything in their path. then you get into the terrible thing with retribution. you have rebels advancing. you have regime fighting back. but i think asan has